Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies
Seven two-dimensional (2-D) seismic refraction lines were used to determine the thickness and geometry of a valley train outwash deposit of the Quaternary Henry Formation near Heyworth in southern McLean County, Illinois. These refraction data were collected and processed in 2-D, then imported into...
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ftmdpi:oai:mdpi.com:/2076-3263/6/1/9/ 2023-08-20T04:07:16+02:00 Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies Matthew Hartz David Malone Robert Nelson agris 2016-02-16 application/pdf https://doi.org/10.3390/geosciences6010009 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/geosciences6010009 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 6; Issue 1; Pages: 9 seismic refraction Illinois Henry Formation valley train outwash 3D geologic model Text 2016 ftmdpi https://doi.org/10.3390/geosciences6010009 2023-07-31T20:50:22Z Seven two-dimensional (2-D) seismic refraction lines were used to determine the thickness and geometry of a valley train outwash deposit of the Quaternary Henry Formation near Heyworth in southern McLean County, Illinois. These refraction data were collected and processed in 2-D, then imported into a Petrel, a three-dimensional (3-D) geological modeling software package. The 3-D geologic model was built using the velocity attribute of the seismic refraction data. The 3-D velocity model was then verified manually by moving a cross-section through the velocity model at 20 m increments. These selected data points were used to create 3-D horizons, surfaces, and contacts constraining the target Henry Formation from the overlying alluvium of the Cahokia Formation and the underlying Delavan Till. Results of the 3-D model show the Henry Formation outwash trends about S10°E, which is oblique to S55°W-trending modern Kickapoo Creek valley. The Henry Formation outwash is confined to the Kickapoo valley, and consists of well-stratified sand and gravel at that is as much as 25 m in thickness in the channel. The thickness of the Henry Formation in the terrace is 8–10 m. The Cahokia Formation is everywhere about 2 m in thickness. The Henry Formation here is interpreted to be deposited in a subglacial tunnel valley that was deposited about 20,000 years ago as the Laurentide ice sheet retreated from its maximum southerly extent. Text Ice Sheet MDPI Open Access Publishing Geosciences 6 1 9 |
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seismic refraction Illinois Henry Formation valley train outwash 3D geologic model |
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seismic refraction Illinois Henry Formation valley train outwash 3D geologic model Matthew Hartz David Malone Robert Nelson Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
topic_facet |
seismic refraction Illinois Henry Formation valley train outwash 3D geologic model |
description |
Seven two-dimensional (2-D) seismic refraction lines were used to determine the thickness and geometry of a valley train outwash deposit of the Quaternary Henry Formation near Heyworth in southern McLean County, Illinois. These refraction data were collected and processed in 2-D, then imported into a Petrel, a three-dimensional (3-D) geological modeling software package. The 3-D geologic model was built using the velocity attribute of the seismic refraction data. The 3-D velocity model was then verified manually by moving a cross-section through the velocity model at 20 m increments. These selected data points were used to create 3-D horizons, surfaces, and contacts constraining the target Henry Formation from the overlying alluvium of the Cahokia Formation and the underlying Delavan Till. Results of the 3-D model show the Henry Formation outwash trends about S10°E, which is oblique to S55°W-trending modern Kickapoo Creek valley. The Henry Formation outwash is confined to the Kickapoo valley, and consists of well-stratified sand and gravel at that is as much as 25 m in thickness in the channel. The thickness of the Henry Formation in the terrace is 8–10 m. The Cahokia Formation is everywhere about 2 m in thickness. The Henry Formation here is interpreted to be deposited in a subglacial tunnel valley that was deposited about 20,000 years ago as the Laurentide ice sheet retreated from its maximum southerly extent. |
format |
Text |
author |
Matthew Hartz David Malone Robert Nelson |
author_facet |
Matthew Hartz David Malone Robert Nelson |
author_sort |
Matthew Hartz |
title |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_short |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_full |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_fullStr |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_full_unstemmed |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_sort |
three-dimensional geologic model of glacial outwash in mclean county, illinois, based on seismic refraction studies |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2016 |
url |
https://doi.org/10.3390/geosciences6010009 |
op_coverage |
agris |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geosciences; Volume 6; Issue 1; Pages: 9 |
op_relation |
https://dx.doi.org/10.3390/geosciences6010009 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences6010009 |
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Geosciences |
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6 |
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9 |
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1774718772221837312 |